#!/usr/bin/env python

# -*- coding: utf-8 -*-

import hashlib

# 始终可用的算法

print('始终可用的算法 : {}'.format(sorted(hashlib.algorithms_guaranteed)))

print('需要结合OpenSSL可用算法 : {}'.format(sorted(hashlib.algorithms_available)))

#!/usr/bin/env python

# -*- coding: utf-8 -*-

import hashlib

md5_obj = hashlib.md5()

md5_obj.update(''.encode('utf-8'))

print(md5_obj.hexdigest())

#!/usr/bin/env python

# -*- coding: utf-8 -*-

import hashlib

salt = ''

md5_obj = hashlib.md5(salt.encode('utf-8'))

md5_obj.update(''.encode('utf-8'))

print(md5_obj.hexdigest())

#!/usr/bin/env python

# -*- coding: utf-8 -*-

import hashlib

sha1_obj = hashlib.sha1()

sha1_obj.update(''.encode('utf-8'))

print(sha1_obj.hexdigest())

#!/usr/bin/env python

# -*- coding: utf-8 -*-

import hashlib

import argparse

lorem = 'Hello World'

parser = argparse.ArgumentParser('hashlib Demo')

parser.add_argument(

    'hash_name',

    choices=hashlib.algorithms_available,

    help='请输入hashlib的名字'

)

parser.add_argument(

    'data',

    nargs='?',

    default=lorem,

    help='请输入要加密的数据'

)

args = parser.parse_args()

h = hashlib.new(args.hash_name)

h.update(args.data.encode('utf-8'))

print(h.hexdigest())

#!/usr/bin/env python

# -*- coding: utf-8 -*-

import hashlib

content = '''Lorem ipsum dolor sit amet, consectetur adipisicing

elit, sed do eiusmod tempor incididunt ut labore et dolore magna

aliqua. Ut enim ad minim veniam, quis nostrud exercitation

ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis

aute irure dolor in reprehenderit in voluptate velit esse cillum

dolore eu fugiat nulla pariatur. Excepteur sint occaecat

cupidatat non proident, sunt in culpa qui officia deserunt

mollit anim id est laborum.'''

#一次性加密：缺点文件大的话，加载到内存会导致内存溢出

h = hashlib.md5()

h.update(content.encode('utf-8'))

all_at_once = h.hexdigest()

#利用生成器，切片加密，对大文件加密有用

def chunkize(size, text):

    start = 0

    while start < len(text):

        chuck = text[start:start + size]

        yield chuck

        start += size

    return

#一行一行加密

h = hashlib.md5()

for chunk in chunkize(64,content.encode(('utf-8'))):

    h.update(chunk)

line_by_line = h.hexdigest()

print('一性次加密结果 : ',all_at_once)

print('一行一行加密结果 : ',line_by_line)